An idea that got stuck in my head ^^
Frost succubi are often seen as the most refined and approachable type of their species for smaller races, ( relatively speaking and depending on the circumstances that is ). It's not uncommon to see reckless or greedy individual attempting to make deals with them in order to gain power.
It's a perilous endeavor though. Frost succubi adore to craft extremely complex and tricky contracts with all sort of legal traps, backdoors, provisions with double meanings, and fine prints. if you are an human seeking to make a contract with a frost succubus, you can be almost certain she will put some explicit clauses where she gets to eat you under certain circumstances. Sometimes right when you sign if you are not careful !
Arale happens to be very talented at that little game and her favorite way of hunting remain to get he prey to walk by themselves right into her mouth because they were bound by it. If you want to sign a contract with her, you better be very prepared !